Get 20M+ Full-Text Papers For Less Than $1.50/day. Start a 14-Day Trial for You or Your Team.

Learn More →

Crystal structure and microtwinning of a calcium-rich analogue of labuntsovite

Crystal structure and microtwinning of a calcium-rich analogue of labuntsovite Abstract The structure of a new representative of the labuntsovite family, which was found in the Khibiny alkaline massif (the Kola Peninsula), was established by the method of X-ray diffraction analysis. The unit-cell parameters are a = 14.365(7) Å, b = 13.887(7) Å, c = 7.814(2) Å, β = 117.36(5)°, sp. gr. Cm, R aniso = 0.058, 1385 F > 4σ(F). The mineral differs from other members of the family by the absence of Na-atoms and the high Ca-content. The Ca-polyhedron is reduced to a seven-vertex polyhedron (the average Ca-O distance is 2.48 Å) compared to the eight-vertex Na-polyhedron (the average Na-O distance is 2.57 Å). The structure channels are orderly occupied, thus lowering the symmetry to Cm. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Crystallography Reports Springer Journals

Crystal structure and microtwinning of a calcium-rich analogue of labuntsovite

Download PDF
3 pages

Loading next page...
 
/lp/springer-journals/crystal-structure-and-microtwinning-of-a-calcium-rich-analogue-of-6U04QFEDPe

References (1)

Publisher
Springer Journals
Copyright
2001 MAIK "Nauka/Interperiodica"
ISSN
1063-7745
eISSN
1562-689X
DOI
10.1134/1.1376460
Publisher site
See Article on Publisher Site

Abstract

Abstract The structure of a new representative of the labuntsovite family, which was found in the Khibiny alkaline massif (the Kola Peninsula), was established by the method of X-ray diffraction analysis. The unit-cell parameters are a = 14.365(7) Å, b = 13.887(7) Å, c = 7.814(2) Å, β = 117.36(5)°, sp. gr. Cm, R aniso = 0.058, 1385 F > 4σ(F). The mineral differs from other members of the family by the absence of Na-atoms and the high Ca-content. The Ca-polyhedron is reduced to a seven-vertex polyhedron (the average Ca-O distance is 2.48 Å) compared to the eight-vertex Na-polyhedron (the average Na-O distance is 2.57 Å). The structure channels are orderly occupied, thus lowering the symmetry to Cm.

Journal

Crystallography Reports – Springer Journals

Published: May 1, 2001

Keywords: Crystallography and Scattering Methods

There are no references for this article.